+ * Fires when spa_sync has not completed within zfs_deadman_synctime_ms.
+ * If the zfs_deadman_enabled flag is set then it inspects all vdev queues
+ * looking for potentially hung I/Os.
+ */
+void
+spa_deadman(void *arg)
+{
+ spa_t *spa = arg;
+
+ zfs_dbgmsg("slow spa_sync: started %llu seconds ago, calls %llu",
+ (gethrtime() - spa->spa_sync_starttime) / NANOSEC,
+ ++spa->spa_deadman_calls);
+ if (zfs_deadman_enabled)
+ vdev_deadman(spa->spa_root_vdev);
+
+ spa->spa_deadman_tqid = taskq_dispatch_delay(system_taskq,
+ spa_deadman, spa, TQ_SLEEP, ddi_get_lbolt() +
+ NSEC_TO_TICK(spa->spa_deadman_synctime));
+}
+
+/*